Experimental evidence of widespread regions of small-scale plasma irregularities in the magnetosphere

Details Experimental evidence of widespread regions of small-scale plasma irregularities in the magnetosphere Experimental evidence of widespread regions of small-scale plasma irregularities in the magnetosphere

May 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....95.6015h&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 95, May 1, 1990, p. 6015-6023. Research supported by the Swedish Board fo

Physics

16

E Region, Magnetic Variations, Magnetospheric Instability, Plasma Waves, Space Plasmas, Viking Spacecraft, Electron Flux Density, Electrostatic Probes, Vertical Distribution

Scientific paper

Small-scale (less than 1 km) plasma irregularities have previously been observed in situ from the E region to an altitude of 8000 km. Results are reported from the Viking plasma wave experiments which extend the measurements of high-latitude irregularities to: (1) electron density fluctuation measurements up to an altitude of 13,500 km, and (2) a measurement technique that made a phase velocity deduction possible from in situ measurements. The spacecraft was equipped with two spatially separated Langmuir probes, each with an ability to measure relative probe current fluctuations with frequencies from dc to about 400 Hz. Under certain assumptions the current fluctuations could be interpreted as relative plasma density fluctuations. Data from this 'interferometric' instrument has been used to infer the distribution and nature of plasma irregularities along Viking orbits. It is demonstrated that the interferometric technique offers great advantages compared to single point measurements in this kind of study. It is shown that the observed small-scale plasma irregularities are 'nondispersive' and convecting with the background plasma. It is concluded that plasma irregularities, in accordance with the present selection criteria, can be present in all regions of space encountered by Viking.

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